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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7c8d81f39fc4740e70c5e02850b44314be64ab3d1a749d21f5b383f869504e18' 
  AND token = 'w8m55C5AhWORWdT5pojF7fdqtuFY5Ml86pFmYq04z0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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