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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '75fbbba6584c555c906a5693dd895891f96e80add06054733224031b3ad489fb' 
  AND token = 'xHbn/XXsCCVdABu9MIFdm2UMfWnnN5pW2duPcI4qnkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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