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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e70e642000fa957f803b6276fe488943cc984a516843b9f7fe0becae68f74f33' 
  AND token = 'DdakWJj89tEChxbz5ccAHr4x5z+aC38HHJ7bkhl7CrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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