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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e2cac724dbc62f111870710ba72784d7966cc61ec77e5c4b8cb57e7e3d314b8e' 
  AND token = 'PwPlPjwtcPhXXgC+VrZUQjxuN3erU3+L3CY5o3OP2Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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