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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7d04857e258c817f61643757c7e2a64498632eef4297d8bd67790eca9187e72e' 
  AND token = 'SIyxIV7WojhK9gw6/zurET+2vzV/Hi86nzI1Ral2ry8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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