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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4abb161bec42c3012e5878bf3a07242bcdfd7ba4b74830f0572e8a7037d49de6' 
  AND token = 'gmcAsW2EckKwbzRY7I/1uBYG0YeIG41CZDQ3kzNDj/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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