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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '91171ef004729c01431c58b0cbc27417ecbcaf66ec6058675d2fb449df82e8a0' 
  AND token = 'C53r8inDeWd/8WB2CjAqmYN5Z43Yd6rvQ3XFINE/V00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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