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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '039bf5e710883c5aeb269a3d0c2b97259a15ebf87fbd335bb819f0c9035decd5' 
  AND token = 'CvmM/KO84atT8Mn2169Tsldh0wF3EibJJ72e57jP3xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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