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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dc1ba931820527e9a7872492cc0c401c7933c3ee46cb55a03decce4ed08c138a' 
  AND token = 'n0rBc1PTWLJ50Zm/MZIybpolmcSHMEGCVM8O5kYh00s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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