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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b5b16c826bb393ad805a636d304df188ec59cb87cadf3329c8bc04e0f567fede' 
  AND token = 'd8ta6OuocLFc1Jrsvxai1lvGVIAnKo0Ft2iggBPxSbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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