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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fc8ebe2fcd0d86e48f398d3e396f875e414942bd1641397384b63bf0e89a8e5e' 
  AND token = 'UEHELGMw8yJyTTsfkZaAL0HOYQLeYZlL/QcLsdcMLZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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