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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e8bdb75a1f89c2c0637b4cb6ebacb28913784727b59a6f3c2f907e16b0ae107a' 
  AND token = 'tlYaRp8w+AcDphC+p96nDdcAmdUqoAaPw1RzSpYlcI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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