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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '473eb1abbd3cb400c0596c6f0640841770372f12c88fc081f3e006cb9a2b9822' 
  AND token = 'W3kajyhT1W3mER0xmuOq8ARResxvjHCgMWXEIfV+MKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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