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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'eb46b8b9a0389b00628271feb9f9e0359a07ac5f31b8a94d731f75546ddcc553' 
  AND token = 'd018OipOxMP1CeWAvkBJNqTPuOajdGfYZr1IpFdJb+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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