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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '8ba3aaa710a9033275443860434ef25b2293f445b8da82b59bfc2fb82877cd4a' 
  AND token = 'sb/y9A/rtZ1gJiZuurfIKihcz+aMlDchSt8whkrjN3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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