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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'deed7677b0e92279022c181725341ff3a51c95e1e20a4cb91e0404c0629c7e60' 
  AND token = 'XC5rL8KBa83j0pHmoJl++mrOA1GFk4N3pXmtrKbLQEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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