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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '12e90d8e0915ec1f247234549bc0a49b411e41cc97049048a26b09ef733ad471' 
  AND token = '7M3Q4cKIkDNsnQNXAruE4Dl6TKBUFExSMBOdcrcdOOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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