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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '281dc3eb04da31ccf15bbcc7d65d49dade453e6b4d0d6d8e31c6516a9dc84dec' 
  AND token = 'UF1gZdFnCaPfMIcjSlBLbXxsgACAq5/rs0wif3a/KzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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