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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a2f20cddaad9970358f118309d35066f2f141f30f6864e4f4f0bd5b54856d2a1' 
  AND token = 'y7esaqnwZXw7AziQ5lFoX4vpoVQrhpvYnAcEuk5c7OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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