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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd0afd5f91d78df732006d7acb407391d39be73cd7857c59da0f9df5056e43c91' 
  AND token = 'WnU6V5QqV55as/vC6uy27/QtymxnsH6Tid74ZoxQGNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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