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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c12f34aad3dce046ab2865b1e6fa9624ea5be8a66f5b57d55cd6c95905c32868' 
  AND token = 'jblWDipAVcNR2750csmv1IAL1CljsY5S9Lr0Xjti0Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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