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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '6cefddffa92900ee7e2d749d0f78f634e89a8c0e92edc5c577b96e93afe066f5' 
  AND token = 'pynfqj0VG4hRJP1rdGfcZ94l/YH1ZXrSb4lTaQeygdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}