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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'bd10bae74629e439d0b8c6506736cb3723da82e36cf42dd8aa2db7408908c26e' 
  AND token = '0r9zFe2tw6ie+JTWo9u8unuw3FGlygweG+zsJItml1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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