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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c02404f9c9e7675297b6e1b4bcfb120c9594a8c2a5f2d5a95e443ffa0a204a2c' 
  AND token = 'Q0yzEI312NhiELDV/IdZnOfDgw8rWxAj52W5O8U7TGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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