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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ba2d1e30c330ff3bdf6232946d76ff1a3881d469e971e7d4bc6df95ccc08ad99' 
  AND token = 'LMuFx+8rwJ1Cw62LMulmTFLOCUH2vOfrGyP3P6rJwyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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