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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0b2757fcd47a0b77bbb6e21bd03d1347eddfbbc5db36abbfb3c8711e715e7412' 
  AND token = 'zIh67lStnAyNT6cmcE1t1LG+hbGWZFKme7sA2irGBho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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