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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7e0115c644340886e7b9441f2ecb07a518a6e5ec96865e907666a13af5845717' 
  AND token = 'IDXegfuXuEGhFbCTLNb49wNu6t2DLMV++jUH4oownw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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