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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '363209107444ca0aefe6bc790a2a43751f154641c9e3fccd6e1b7781f7922fe4' 
  AND token = 'H3xuoNQH/y0UfMrSHSQK9xSeq33yTJl2mVcwnExLEso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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