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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dde64ca77d0cffc626021307a53894fd78660abbdbb051da6b51897f0f1bd585' 
  AND token = '9rEZ8PWiX761U6PPlezuu3iHW6Fr9s/Jw9g4QGr95II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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