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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0cd94f4b62248f0ff3e9922fafb85936b8e17d4f8b61096cc0b4dec19e8f060b' 
  AND token = 'Y+Xow+ttH+fOHPABMKYcA5azoIf4IBF/kscPdh/yQkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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