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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a0432b95d8ee8b393c77c52339a853ede718f47effa6ec6cc2150c56a1c5eb73' 
  AND token = '9aoctXkUJ2+UzYM/uTDDK+X825tZAibxjbyD3Gg3llY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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