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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1ce1bf8f9bda4c8b630b40cb887cd02ce2c6d2063b17c0f70d518bf6eb49abfe' 
  AND token = 'iB4Vw1WNFItVX3t7gR5gO7gFpfUuhDmVQG/kTjGAnFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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