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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f44d853621cc05532215b8a42cd15ac448bcb60ded9096024178ca759b8a1604' 
  AND token = 'pSsAc4l0lsG+Q/zknsG20DmPs+5HtudQZsf+9s1GEks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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