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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c9bc195706ebac72235e38a5ae433b105558136035b3dbc7187aa7abc220c23e' 
  AND token = 'rBUJOtR/jmDcspoaieCAKtUw9JJ/zhtEN6g3KY0dYKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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