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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'aa4033df946a5d790fe53ca0a3538630fed60efcdde3963a595753c0f9ea86a5' 
  AND token = 'audMvARbevHp3ie/rWH4RTuuv78MVl7Afqenlej4+aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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