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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b60cd41b5d08794dec059ae80410e2477d00b7173fbb0c7294c0f280aa5ed593' 
  AND token = 's4q8ChrN2xD3MR2QI06zu0ZSz2ni/H8y+eiZr4z0NPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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