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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5e03e21c9d65dcd3d94f117ffdf12f013a91805665d69ea42e61b184b46e3333' 
  AND token = 'HVcvdQ3l33JQMcbNQ6aZ5ZSmn/H4PSmYLbLZ3WVG+Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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