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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '38c08c698edfae026e9d75daa070678415d62f8d7dc75c65044f15d52e384c5e' 
  AND token = 'lPD/vgRXL/H0FVRVmqldq4es9I2DNaIYXK8nGb2i1w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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